I checked using the shunt capacitor. On terminal 1 and 2 I thought that some of the higher frequency "breezing" disappeared using the capacitor. There was still a very low hum which may have been a low 50hz tone. It was hard to determine.
Then I checked using the same cap at terminal 4 and 5 and the same thing was noticed but in the left channel. What does this tell us? As I understand the capacitor removes the higher frequencies which makes sense but what new information has been learned here?
As a side note I also poked around the inside of the amp, the chop-stick test, and could not produce any noise by poking there.